11/24/2020: Done a bit of reorganizing here. In the right panel are quick links to the contents of the site. Hope they help you find what you're looking for. On the orders page is a listing of what's currently available. You can just copy and past the listing to your email with your selections indicated and save some time. In the How To page I've added a MaxESP3 assembly tutorial. I'm going through a few hundred emails to mine questions and answers for the FAQs, so there's nothing there at the moment.
11/14/2020: Frankly, I don't know when the STM32F103C8 supply/situation is going to be resolved. In the interim I'm dropping the price of the MaxESP3 to $40 to fill the gap.
Here's the situation; STM has introduced some new processors and the supply of STM32F103C8 BluePills with 128K have disappeared. There are 64K versions around, but we can't use them. Whether this is a marketing ploy to push their newer designs or just poor planning is your best guess. RobotDyn has stopped taking orders on AliExpress for the STM32F303CC, the only proven replacement. The ones I ordered haven't moved in 5 weeks. It appears the ST or the devboards makers weren't prepared for the demand.
There are other sellers, but their devboards are not pin compatible with the F103C8 and they are running $11. The F303CC runs at 72MHz, a bit slower than the Teensy 3.2, but still half the speed of the ESP32. It has the required memory and can have a RTC added. Right now these are in short supply or too expensive for the STM32 kit.
Other possibilities are the CS or CKS32F103C8 and, APM32F103CB.
Due to time constraints, I am going to have to stop offering the assembling and testing of kits. I am working on a project for an assembled kit I hope to offer in the new year.
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